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(A) Alignment of the substrate-binding domain of BusAB (residues 288 to 573) with the N-terminal part of pro-OpuAC (residues 1 to 182). (B) Alignment of the substrate-binding domain of BusAB (residues 288 to 573) with the C-terminal part of mature OpuAC (residues 163 to 273) of B. subtilis.
